fix: apply bedrock geo pricing

[analogpvt]

Depends on #2547 for the updated Bedrock Claude region/profile list.

Summary

• Apply AWS Bedrock 1.1x pricing to every non-global regional/inference profile entry.
• Keep AWS Bedrock global at 1x pricing.
• Cover geo profiles and in-region cross-region entries such as eu-west-2.
• Apply the multiplier across token pricing fields, including input, output, cache read, 5m cache write, 1h cache write, and pricing tiers.

Pricing checks

Model/region	Input / 1M	Output / 1M	5m cache write / 1M	1h cache write / 1M	Cache read / 1M
claude-opus-4-8:global	$5.00	$25.00	$6.25	$10.00	$0.50
claude-opus-4-8:us	$5.50	$27.50	$6.875	$11.00	$0.55
claude-opus-4-6:eu-west-2	$5.50	$27.50	covered by multiplier	covered by multiplier	covered by multiplier

Validation

• pnpm format
• node_modules/.bin/vitest run packages/models/src/providers.spec.ts
• node_modules/.bin/turbo run build --filter=@llmgateway/models
• node_modules/.bin/vitest run apps/gateway/src/lib/costs.spec.ts

Summary by CodeRabbit

• New Features

  • Expanded AWS Bedrock regional availability to include additional geographic regions (au, jp, eu-west-2, eu-west-3, ap-northeast-2, and others).
  • Implemented region-specific pricing adjustments for AWS Bedrock non-global regions.

• Tests

  • Added validation for AWS Bedrock regional pricing and model region configuration.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: eced05a5-e1c3-4154-9272-1d8a3df6f61b

📥 Commits

Reviewing files that changed from the base of the PR and between b1530c0 and 962691e.

📒 Files selected for processing (5)

• apps/gateway/src/lib/costs.spec.ts
• packages/models/src/models/anthropic.ts
• packages/models/src/providers.spec.ts
• packages/models/src/providers.ts
• packages/models/src/region-helpers.ts

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Walkthrough

Adds a 10% price uplift for non-global AWS Bedrock regions by introducing price multiplication helpers and applyAwsBedrockRegionalPricing in region-helpers.ts. The aws-bedrock provider config in providers.ts gains new regions (au, jp, expanded EU/APAC) with updated endpoints and model prefix mappings. Thirteen Anthropic model provider entries receive regions arrays, and new tests validate region coverage and pricing behavior.

Changes

AWS Bedrock Regional Pricing

Layer / File(s)	Summary
Bedrock regional pricing multiplier packages/models/src/region-helpers.ts	Adds price string multiplication helpers (including e-exponent form), applyAwsBedrockRegionalPricing that applies a 1.1x multiplier to all token price fields and PricingTier prices for non-global aws-bedrock regions, and updates expandProviderRegions to call it instead of plain object spreading.
AWS Bedrock provider regionConfig packages/models/src/providers.ts	Reworks aws-bedrock regionConfig to add au, jp, and expanded EU/APAC geographic regions; extends endpointMap with new Bedrock runtime endpoint URLs; and updates modelPrefixMap with routing prefixes for all added regions.
Anthropic model region annotations packages/models/src/models/anthropic.ts	Adds regions arrays to 13 AWS Bedrock-backed Anthropic model provider entries (claude-3-7-sonnet, claude-3-5-sonnet-20241022, claude-sonnet-4-5/4-6, claude-haiku-4-5, claude-opus-4-1/4-5/4-6/4-7/4-8, etc.), enumerating each model's supported region IDs.
Provider region tests packages/models/src/providers.spec.ts	Adds describe("AWS Bedrock Anthropic regions") suite: validates modelPrefixMap defaults, checks no unused configured regions exist, asserts per-model region ID sets, and spot-checks that non-global region expansion produces a 10% uplift across all token price fields.
Cost calculation integration tests apps/gateway/src/lib/costs.spec.ts	New it(...) block confirms calculateCosts returns global pricing for global location and 10%-higher costs for regional locations, validates cache write costs across 5-minute and 1-hour buckets, and checks cached read cost for a regional request.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

Possibly related PRs

• theopenco/llmgateway#2034: Adds a new claude-opus-4-7 AWS Bedrock provider entry to anthropic.ts, the same file where this PR expands region arrays for multiple Bedrock providers.
• theopenco/llmgateway#2344: Introduced the AWS Bedrock region routing model (providers.ts regionConfig, endpointMap, modelPrefixMap) that this PR extends with new regions and a pricing multiplier.
• theopenco/llmgateway#2542: Adds the claude-opus-4-8 AWS Bedrock provider entry in anthropic.ts, which this PR subsequently annotates with a regions array.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 20.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'fix: apply bedrock geo pricing' accurately and concisely describes the main change: applying geographic pricing adjustments to AWS Bedrock. It clearly identifies the primary modification across the changeset.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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🧪 Generate unit tests (beta)

• Create PR with unit tests

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